Remove outdated sections from README

Author: AA-Turner

README.rst

@@ -14,23 +14,6 @@ Install from PyPI::
 
    pip install -U sphinxcontrib-serializinghtml
 
-Release signatures
-==================
-
-Releases are signed with following keys:
-
-* `498D6B9E <https://pgp.mit.edu/pks/lookup?op=vindex&search=0x102C2C17498D6B9E>`_
-* `5EBA0E07 <https://pgp.mit.edu/pks/lookup?op=vindex&search=0x1425F8CE5EBA0E07>`_
-
-Testing
-=======
-
-To run the tests with the interpreter available as ``python``, use::
-
-    tox
-
-Continuous testing runs on travis: https://travis-ci.org/sphinx-doc/sphinxcontrib-serializinghtml
-
 Contributing
 ============